五年级上册 数学 口算天天练 5

1.直接写出得数。

0.25×0.4= 1.6÷0.8= 1÷2.5= 1.25×0.8= 3.2÷0.04=

0÷1.7= 0.22×102= 0.8×0.2= 5.6×3=(1.2＋8.8)×0.4=

0.25×4= 3.1×0.2= 0.45×6= 0.4×0.25= 3.6×0.8=

2.9×1= 9.6×3= 0.05×0.4= 120×0.5= 7.3×4=

0.75×2=  4.3×0.2= 12.5×8= 66×0.4= 6.01×0.3=

0×34.5= 45.2×2= 1.3×3= 4.25×4= 0.07×0.5=

33×0.04= 6.5×4= 2.3×0.06= 0.8×0.9= 15×0.08=

0.09×0.9= 4.7×0.1= 54×0.8= 1.6×0.03=   0.6×100=

17.5×0.01= 3.2×0.5= 25×0.4= 12.5×0.8= 6×6.5=

3.6×0.7= 6.5×0.4=  8.5×0.2= 0.66×0.3= 2.5×0.4= 

2. 用竖式计算：

102×12=

102×120=

102×24=

109×90=

430×40=

3. 脱式计算，能简便的用简便方法计算。

50.4×1.9-1.8  

7.06×2.4-5.7

72×0.81+10.4

0.75×18÷0.15

2.07÷0.23÷0.45